must have been - My mother has arrived late. She ....... in a traffic jam., may have passed - We ..... the math exam, but it was French., may have taken - Alex ...... the wrong train., could have  - I´m sorry but, you ...... played better., couldn´t have passed - She ..... because she hadn´t studied enough., should have - You ..... listened to the teacher., shouldn´t have - She .... told them., needn´t have - I .... read the book.,

:d

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